Ahead of the make-or-break FIFA World Cup qualifying playoff against Syria next month, Ange Postecoglou's squad have dropped to 50th, down five places from last month.
It comes after the Caltex Socceroos had a win (2-1 over Thailand) and a loss (2-0 to Japan) in their most recent FIFA World Cup qualifiers.
Syria, Australia's next opponent on October 5 in Malaysia and in Sydney five days later, have moved up five places to number 75.
That ranking is the highest-ever for Syria.
World champions Germany have returned to the summit, replacing Brazil - who have moved back to second - at the top.
Iran remain the top-ranked nation in Asia in 25th spot, with Japan at 40 and Korea Republic just behind the Caltex Socceroos at 51.
FIFA 18 will be released worldwide on Friday 29 September, while those who pre-order the Ronaldo or Icon editions through easports.com/FIFA18 can receive 3 Days Early Access.
This article was originally published at: http://www.socceroos.com.au/article/latest-fifa-world-rankings-for-caltex-socceroos/vegbbn5vnlni10tygbsde9mdv.